Muffler



Patented Dec. 16, 1924.

GFFECE,

RALPH R. BUMBAUGH ATND CHARLES W. STQNE, @F EQTGELES, CALIFORNIA.

MUFFLER.

Application filed December 9, 1922. Serial No. 605,799.

To all whom it may concern:

Be it known that we, RALPH it. BUM- BAUGH and CHARLES W. STONE, of Los Angeles, California, have invented a certain new and useful Mufiler, of which the following is a specification.

Our invention relates to a means for muffling sounds and has especial reference to a device for deadening noises particularly of escaping gases or vapors, and for use more specifically in connection with the exhaust ofa vapor or combustion engine, an object of the invention being to provide a simple, cheap and light device that is readily adaptable to an engine to receive exhausted gases, vapors and the like, and in which such a didusion of the exhausting gas charges is effected that practically the entire force of the expansion ensuing upon discharge is dispersed before escaping, consequently eliminating all noise or report that otherwise would accompany the immediate release of the exhausted gas to the atmosphere.

Another object of the invention is to provide a mufiing device in which the eifective deadening or silencing of the exhaust reports may occur without choking or impeding the free expansion of the gases and hence without imposing or creating any backpressure.

These and other objects are accomplished by the device illustrated in the accompanying drawing, in which the view is a sectional elevation of a preferred form of the inven tion, and described in the following specification.

The invention consists of an enclosure provided with arrangements that will reduce the force of the exhaust gases to a minimum from the time of entrance to the time of escape of them. Specifically, the invention comprises a chamber 1, adapted to beattached to the exhaust leading from a combustion motor, by any suitable means, as threading onto the end of a pipe, not shown, through which the products of combustion are carried. In the preferred form illustrated in the figure, the lower edge of the chamber 1, is flared, as seen at 2, and to such flaring periphery, is bolted or otherwise fastened, a plate 3, constituting the bottom of and closing the chamber 1. This plate 3 is provided with a central opening 4-, through which the exhaust products are received into the chamber, and to enable the chamber to be attached to the exhaust from an engine, a flanged annulus 5 is provided, such annulus being preferably bolted onto the plate 3 and internally threaded, and the opening of which annulus is in register with the opening 4: of the plate 3. The chamber 1 is divided into a plurality of compartments 6-7-8-9 and 10, by the partition plate or wall 3, and plates 6', 7, 8 and 9", each partition wall being provided with a central opening 6", 7", 8 and 9", and the openings in the partition plates or walls 6, 7, 8' and 9 decreasing diametrically from the. bottom, or that point where the ingress of the combustion gases occurs. compartments 6, 7, 8, 9 and 10 are in com munication with one another through the said openings in the walls or plates, whereby the exhaust gases may enter each compartment with a progressive diminution of force, due to the successive diametrical decrease of. the openings therein, and wherein a further dissipation of the force may be caused in such compartments. F or the purpose of bringing about a speedy reduction of the force of the exploded gases with the ensuing elimination of noises or reports incident on any sudden displacement of air, the compartments 6, 7, 8, 9 and 10 are severally provided with peripheral ports or orifices 11, 12, 13, 1d and 15, the ports or orifices ll, 12 and 18 being greater in number than those in the compartments 1d and 15, and functioning to break up the expanding gases into numerous streams, the force of each of which is reduced to a point where the opposing air ofiers little or no resistance to them, and. consequently they escape without noise or audible sound.

Centrally of, and extending for a short distance within the last compartment 10 of the series, is a pipe 16 of any desirable length. This pipe 16 is centrally alined with all the openings 6", 7", 8, 9 and 3 and is arranged to convey or carry ofl those gases of combustion, which have not priorly escaped during their travel through the muftier. 'lo retard the sudden and forceful escape of the gases through said pipe 16, a battling means is provided therein, such loaf.- fling means consisting preferably of a spiral 17, fastened in said pipe in any manner.

The chamber 1, with the various arrange- All the ments, as described, is in itself an eiiicient means for accomplishing the purposes aimed at, to-wit, the silencing of noises of escaping gases. As an added insurance however, against even the smallest noises and reports, that might be a disturbing factor in residential districts where combustion engines are operated, the chamber 1, may be encased in a shell or jacket 18, arranged to be bolted or otherwise fastened to said plate 3, and provided in the top thereof with an opening 19, diametrically larger than said pipe 16, which extends therethrough. This shell or jacket 18 is held spaced from the chamber 1 by suitable means 20, and into the space 20' between the shell or jacket 18 and chamher 1, the exhaust gases, deprived nearly entirely of their force by their passage through the numerous openings in the various compartments of the chamber 1, escape, losing therein practically all of their expansive force and pass noiselessly into, the atmosphere.

Where a cooling medium, as water, is used, before the hot gas of combustion enters the mufliing arrangement herein described, the water of condensation may be drained from the mufller through a pipe 21.

What we claim, is: A mufiler comprising a chamber arranged for attachment to a conveying means for exhaust gases, said chamber having a plurality of equally distanced plates within and extending entirely across and dividing said chamber into a plurality of compartments, each plate having a central opening, and the openin in each plate decreasing diametrically rom the inlet to the outlet, each of said compartments provided with a plurality of series of circumferential rows of lateral ports, the ports in several of the said compartments being greater in number than in others, a pipe connected to one end of said chamber and communicating directly with the end compartment, a gas retarding means in said pipe, and a jacket enveloping and free of said chamber and provided in the end thereof with an opening through which said pipe extends.

In testimony whereof we have set our hands.

RALPH R. BUMBAUGH. CHARLES WV. STONE. 

